Rails - Apr 2010 - render_to_string + json problem

I am stucked at some major issue with the AjaxForm and render_to_string.

I am using AjaxForm for uploading images with other details since the Ajax
Upload library isn''t even using Ajax. So once the form is submitted i
need
to call a partial and return it in a json format. but the problem is that
the render_to_string is not working at all. In case if i am returning simple
string then it''s working fine.

reference http://jquery.malsup.com/form/#file-upload

#server Ruby on rails
def some_action
  respond_to do |format|
    @html = render_to_string(:partial => "form.html.erb", :object
=> [@obj1,
@obj2])
    json = { :success => "Added successfully", :html => @html }
    format.html { render :json => json }
  end
end

#client side
$("#upload").ajaxForm({
        dataType: "json",
        success: function(response) {
          console.log(response);
          console.log(response.html);
  });
return false;
});

Thanks for any help
Abhis

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